Canon Speedlite 90EX - Manual (Page 16)

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• Shutter sync. (1st curtain*/2nd curtain)
- 1st curtain: This is the normal flash shooting mode in which the flash fires at the
timing when the shutter is fully open.
- 2nd curtain: The flash fires right before the shutter closes.
• Flash exp. comp
You can adjust the flash output level in the same way as normal exposure
compensation.
• E-TTL II (Evaluative*/Average)
- Evaluative: Fully automatic flash shooting can be performed, from dark scenes
to fill-flash shooting.
- Average: Metering is averaged for the entire scene.
• Wireless functions (Off*/Optical transmission) (p.15)
• Optical channel (1* to 4)
• Flash group (ALL, A:B, A:B C)
• Group exposure compensation (A, B, C)
• Ratio control (8:1 - 1:8, 1/2-stop increments)
 [Flash C.Fn settings]
1: Auto power off (Enabled*/Disabled)
COP
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